Transferring imagery files

[KerriFay]

I'm trying to transfer large imagery files onto an external drive and certain files say they are too large to transfer... like .ige and .rde files.
Are these files necessary?

[EricRice]

Kerri,

The fact that you have an .ige and .rde file means your raster is over 2gb in size.  These files contain the overflow that exceeds the first 2gb's stored in the .img file.  You must move these files with the .img file or the data will no longer work.  I recommend moving raster data with ArcCatalog since the system knows which files to move and all you have to worry about it is picking which raster 'datasets' you want to move, rather than determining the right files in Windows Explorer to  move.  I'm sure you've noticed by now that raster data can have a plethora of associated files when viewed through Windows Explorer.

Regards,
Eric

[DanielWolf]

Hi ESRI People,

I'm trying to manipulate an .IGE file too. I've downloaded the National Land Cover Database's 2006 Percent Developed Imperviousness data, available here: http://www.mrlc.gov/nlcd06_data.php

I've tried using winzip and winrar, both of which bring up error messages during the unzipping process. Files do appear, however, in the folder I have designated for extracting the files, including an .IMG file. I can load this .IMG file into ArcMAP 10.1 and QGIS 1.8.0. In either of those programs, I can view the image, but I can't clip it to a shapefile, lest error messages appear. I have tried loading the this .IMG file into Opticks 4.10.0 32-bit as well, but error messages appear.

I wonder if I didn't unzip the compressed file properly? Any suggestions will be greatly appreciated, thanks.